JP2016192585A - Portable terminal, sound field correction method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal device which can easily measure a sound field and can correct a sound field characteristic of a cabin.SOLUTION: A portable terminal can communicate with a server which generates sound field correction data by vehicle types by using a plurality of pieces of uploaded sound field measurement data by vehicle types, measures a sound field of a first vehicle and generates first sound field measurement data. The portable terminal acquires vehicle type information of the vehicle becoming an object of measurement, acquires model information of the portable terminal used for measurement and transmits the sound field measurement data, the vehicle type information and the model information to the server. The portable terminal receives the sound field correction data by vehicle types, which is generated based on the sound field measurement data generated by a model determined to be appropriate in measurement in response to the model information and generated by the vehicle type displayed by the vehicle type information, from the server.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a method for correcting a sound field characteristic in a vehicle.

  A method of correcting sound field characteristics such as a listening room by an AV system is known. For example, Patent Document 1 describes a technique of using a built-in microphone of a mobile phone as a microphone for measuring a sound field in an audio system having a sound field correction function.

JP 2007-259391 A

  In the conventional sound field correction method, correction data is generated by synchronously adding a large number of measurement data obtained indoors, so that a long time of, for example, 7 to 8 minutes is required for sound field measurement. In addition, since a relatively high level of test sound is output in the room during that time, the user generally needs to leave the room during sound field measurement.

  On the other hand, there are in-vehicle devices that have a function to correct the sound field characteristics of the passenger compartment. The correction function was not used effectively.

  Examples of the problems to be solved by the present invention include those described above. An object of this invention is to provide the terminal device which can measure a sound field easily and can correct the sound field characteristic of a compartment.

  The invention according to claim 1 is a portable terminal capable of communicating with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data, and the sound of the first vehicle Measuring means for measuring the field and generating first sound field measurement data; first obtaining means for obtaining vehicle type information of the vehicle subjected to the measurement; and model of the portable terminal used for the measurement A second acquisition means for acquiring information, a transmission means for transmitting the sound field measurement data, the vehicle type information, and the model information to the server, and a model determined to be appropriate in the measurement based on the model information. Receiving means for receiving, from the server, vehicle type sound field correction data generated based on the sound field measurement data generated and generated by the vehicle type indicated by the vehicle type information.

  The invention according to claim 5 is a sound field correction method that is executed by a portable terminal that can communicate with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data. Measuring a sound field of the first vehicle to generate first sound field measurement data, a first acquisition step of acquiring vehicle type information of the vehicle subjected to the measurement, and the measurement A second acquisition step of acquiring model information of the mobile terminal used in the transmission, a transmission step of transmitting the sound field measurement data, the vehicle type information, and the model information to the server, and the measurement based on the model information. Receiving the vehicle type sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the vehicle type and indicated by the vehicle type information from the server; With It is characterized in.

  According to a sixth aspect of the present invention, there is provided a program executed by a portable terminal having a computer and capable of communicating with a server that generates vehicle type sound field correction data using a plurality of uploaded vehicle type sound field measurement data. The measuring means for measuring the sound field of the first vehicle to generate the first sound field measurement data, the first acquiring means for acquiring the vehicle type information of the vehicle to be measured, the measurement Second acquisition means for acquiring the model information of the mobile terminal used in the transmission, transmission means for transmitting the sound field measurement data, the vehicle type information, and the model information to the server, and appropriate in the measurement based on the model information Receiving means for receiving vehicle type sound field correction data generated based on the sound field measurement data generated by the vehicle type determined by the vehicle type and indicated by the vehicle type information from the server Characterized in that to function the mobile terminal as a.

1 shows a configuration of a sound field correction system according to an embodiment. It is a block diagram which shows the structure of a server. An example of correction data is shown. It is a block diagram which shows the structure of the portable terminal and vehicle equipment in a vehicle interior. It is a flowchart of the correction data provision process by 1st Example. The example of the sample number according to the measurement item in 2nd Example is shown. It is a flowchart of the correction data provision process by 2nd Example. The example of the model evaluation of the portable terminal in 3rd Example is shown. It is a flowchart of the correction data provision process by 3rd Example. The example of the correction data in 4th Example is shown. It is a flowchart of the correction data provision process by 4th Example. The example of the correction data in 5th Example is shown. It is a flowchart of the correction data provision process by 5th Example.

  In a preferred embodiment of the present invention, a portable terminal capable of communicating with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data uses the sound field of the first vehicle. Measurement means for measuring and generating first sound field measurement data, first acquisition means for acquiring vehicle type information of the vehicle that is the object of measurement, and model information of the portable terminal used for the measurement Generated by a second acquisition means for acquiring, a transmission means for transmitting the sound field measurement data, the vehicle type information and the model information to the server, and a model determined to be appropriate in the measurement based on the model information. And receiving means for receiving, from the server, vehicle type sound field correction data generated based on the sound field measurement data generated by the vehicle type indicated by the vehicle type information.

  The mobile terminal can communicate with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data, and first measures the sound field of the first vehicle. First sound field measurement data is generated. In addition, the vehicle type information of the vehicle to be measured is acquired, the model information of the mobile terminal used for the measurement is acquired, and the sound field measurement data, the vehicle type information, and the model information are transmitted to the server. Then, the mobile terminal generates vehicle type sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the measurement based on the model information and generated by the vehicle type indicated by the vehicle type information. Receive from the server. Thereby, the sound field in the vehicle can be corrected using the vehicle-specific sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the measurement.

  One aspect of the portable terminal includes a storage unit that stores the model information, and the second acquisition unit acquires the model information by reading the model information from the storage unit. Thereby, the portable terminal can acquire model information without having to ask the user for input.

  In another aspect of the portable terminal, the receiving means is a sound field of a second vehicle that is a vehicle different from the first sound field measurement data and the first vehicle and that is the vehicle type. Vehicle type sound field correction data corresponding to the vehicle type information generated on the basis of the second sound field measurement data generated by measuring the vehicle type sound field, and the vehicle type sound field correction data received from the server. Is transferred to a vehicle-mounted device attached to the vehicle. In this aspect, the sound field in the vehicle can be corrected using the vehicle-specific sound field correction data generated based on the sound field measurement data acquired from a plurality of vehicles of the same vehicle type.

  In another aspect of the portable terminal, the measurement unit includes an output unit that outputs a test signal to an on-vehicle device attached to the vehicle, and the on-vehicle device reproduces the test signal so that the vehicle of the vehicle Sound collection means for collecting the test sound output to the room and generating the sound field measurement data. In this aspect, the sound field measurement data can be generated by outputting a test signal from the vehicle-mounted device mounted in the vehicle.

  In another preferred embodiment of the present invention, a sound field correction method executed by a portable terminal capable of communicating with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data. Measuring a sound field of the first vehicle to generate first sound field measurement data, a first acquisition step of acquiring vehicle type information of the vehicle subjected to the measurement, and the measurement A second acquisition step of acquiring model information of the mobile terminal used in the transmission, a transmission step of transmitting the sound field measurement data, the vehicle type information, and the model information to the server, and the measurement based on the model information. Receiving the vehicle type sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the vehicle type and indicated by the vehicle type information from the server; Be equipped That. Also by this method, the sound field in the vehicle can be corrected using the vehicle-specific sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the measurement.

  In another preferred embodiment of the present invention, it is executed by a portable terminal having a computer and capable of communicating with a server that generates vehicle type sound field correction data using a plurality of uploaded vehicle type sound field measurement data. The program for measuring the sound field of the first vehicle to generate first sound field measurement data, the first acquisition means for acquiring the vehicle type information of the vehicle that is the object of measurement, the measurement Second acquisition means for acquiring the model information of the mobile terminal used in the transmission, transmission means for transmitting the sound field measurement data, the vehicle type information, and the model information to the server, and appropriate in the measurement based on the model information A receiver that receives from the server vehicle-specific sound field correction data generated based on the sound field measurement data generated by the vehicle type determined by the vehicle model and indicated by the vehicle type information. The to function portable terminal as. By executing this program, it is possible to correct the sound field in the vehicle using the vehicle-specific sound field correction data generated based on the sound field measurement data generated by the model determined to be appropriate in the measurement. . This program can be stored and handled in a storage medium.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
(Constitution)
FIG. 1 shows the overall configuration of the sound field correction system according to the first embodiment. The server 10 and the mobile terminal 20 used in the vehicle 7 can communicate with each other through the network 5. A typical example of the network 5 is the Internet.

  The server 10 receives in-vehicle sound field measurement data for each vehicle type from a plurality of portable terminals 20. And the server 10 produces | generates and memorize | stores the sound field correction data for vehicle interior for every vehicle type, and transmits the sound field correction data of the vehicle to the portable terminal 20 of the vehicle 7. FIG.

  In the vehicle 7, the mobile terminal 20 is connected to an in-vehicle device 30 that is an acoustic device. The portable terminal 20 transmits the measurement data of the sound field characteristics of the passenger compartment to the server 10. In addition, the mobile terminal 20 receives the sound field correction data from the server 10 and transfers it to the vehicle-mounted device 30. The transferred sound field correction data is set in the vehicle-mounted device 30. Thus, when music is played by the vehicle-mounted device 30, sound field correction based on the set sound field correction data is performed.

  Next, the server 10 will be described in detail. FIG. 2 shows the internal configuration of the server 10. The server 10 includes a communication unit 11, a control unit 12, a storage unit 13, and a correction data DB (database) 14.

  The communication unit 11 is a unit for communicating with the mobile terminal 20 via the network 5. The control unit 12 controls the entire server 10. The control unit 12 includes a computer such as a CPU, and performs various controls by executing a program prepared in advance.

  The storage unit 13 includes a ROM, a RAM, a hard disk, and the like, and stores various programs executed by the control unit 12. The storage unit 13 also functions as a work memory when the control unit 12 performs various processes.

  The correction data DB 14 stores sound field correction data (hereinafter simply referred to as “correction data”) for each vehicle type. The correction data is data for correcting the sound field characteristics in the vehicle when the audio device reproduces music in the vehicle, which is set in the audio device mounted on the vehicle 7.

  FIG. 3 shows an example of the contents stored in the correction data DB 14. The correction data DB 14 stores correction data for performing appropriate sound field correction in the vehicle compartment of each vehicle type. Preferably, the “vehicle type” information includes “year” in addition to “vehicle type name”.

  Next, the configuration of the vehicle 7 will be described. FIG. 4 shows the configuration of the mobile terminal 20 and the vehicle-mounted device 30 in the vehicle 7. The portable terminal 20 is connected to the vehicle-mounted device 30, and the vehicle-mounted device 30 is connected to a speaker 35 mounted on the vehicle. Note that the mobile terminal 20 and the vehicle-mounted device 30 may be wired by a cable or the like, or may be wirelessly connected by Bluetooth (registered trademark) or the like.

  The mobile terminal 20 includes a communication unit 21, a control unit 22, a storage unit 23, a touch panel 24, a microphone 25, and an output unit 26.

  The communication unit 21 is a unit for communicating with the server 10 via the network 5. The control unit 22 controls the entire mobile terminal 20. The control unit 22 is configured by a computer such as a CPU, and performs various types of control, particularly correction data provision processing described later, by executing a program prepared in advance.

  The storage unit 23 includes a ROM, a RAM, a hard disk, and the like, and stores various programs executed by the control unit 22. The control unit 22 also functions as a work memory when performing various processes. Furthermore, the memory | storage part 23 has memorize | stored the test signal used for the sound field measurement in a vehicle. The test signal St is downloaded from the server 10 and stored in the storage unit 23 before the sound field is measured in the vehicle.

  The touch panel 24 has both a display function and an input function. Information / images displayed to the user are displayed on the touch panel 24, and input performed when the user touches the touch panel with a finger or the like is acquired by the touch panel 24.

  The microphone 25 is a microphone built in the mobile terminal 20. The output unit 26 outputs a test signal St to the vehicle-mounted device 30 when the sound field measurement is performed in the vehicle 7.

  In the above configuration, the communication unit 21 functions as the transmission unit, reception unit, and transfer unit of the present invention, the control unit 22, the microphone 25, and the output unit 26 function as the measurement unit of the present invention, and the touch panel 24 of the present invention. It functions as a first acquisition unit, and the touch panel 24 or the control unit 22 functions as a second acquisition unit of the present invention. The output unit 26 functions as output means of the present invention, and the microphone 25 functions as sound collection means of the present invention.

(Sound field measurement method)
Next, the sound field measurement performed inside the vehicle 7 will be described. In the sound field measurement, the mobile terminal 20 outputs a test signal St prepared in advance to the vehicle-mounted device 30, and the vehicle-mounted device 30 reproduces the test signal St through the speaker 35 and outputs the test sound S to the vehicle interior. Note that the test signal St is a signal prepared for measuring an impulse response, a frequency characteristic, a reverberation characteristic, and the like as the sound field characteristic.

  The test sound S output to the passenger compartment is picked up by the microphone 25 and temporarily stored in the storage unit 23. The control unit 22 transmits the collected data as measurement data to the server 10 via the communication unit 21. The portable terminal 20 adds the vehicle type information of the vehicle 7 when transmitting the measurement data to the server 10. That is, the measurement data is uploaded to the server 10 together with the vehicle type information of the vehicle that has performed the measurement.

(Correction data generation method)
Next, a method for generating correction data in the server 10 will be described. As described above, when a plurality of portable terminals 20 upload measurement data to the server 10, a large number of measurement data is collected in the server 10. The server 10 classifies the measurement data uploaded from the mobile terminals 20 of a plurality of vehicles for each vehicle type, and generates correction data. Specifically, the server 10 generates correction data by synchronously adding a plurality of measurement data uploaded from a plurality of portable terminals 20 for the same vehicle type. Synchronous addition emphasizes the sound field characteristics unique to the vehicle model, and smoothes the characteristics and characteristic variations of individual vehicles, and correct data that accurately represents the sound field characteristics of the vehicle cabin of the vehicle model. Is obtained.

  Basically, the larger the number of measurement data to be subjected to synchronous addition (hereinafter also referred to as “sample number”), the more accurate correction data can be created. On the other hand, in each vehicle 7, it is burdensome for the user to repeat the measurement or perform the measurement for a long time. Therefore, in each vehicle 7, the portable terminal 20 acquires one measurement data by one measurement and uploads it to the server 10, and the server 10 acquires a large number of measurement data from the plurality of portable terminals 20, Increase the number of samples for synchronous addition. This makes it possible to collect a large number of samples and generate accurate correction data for each vehicle type while preventing an excessive measurement load on each vehicle 7.

  Examples of actual sound field correction include time alignment correction, frequency characteristic correction, reverberation characteristic correction, and the like. The time alignment correction is a correction that corrects a difference in distance between a plurality of speakers mounted on the vehicle and a listening position in the passenger compartment so that sounds output from the plurality of speakers simultaneously reach the listening position. . The correction of the frequency characteristic is correction for adjusting the gain for each band so that the frequency characteristic in the passenger compartment is basically flat. The reverberation characteristic correction is correction for adjusting the reverberation time in the passenger compartment to an appropriate time.

(Correction data provision process)
Next, the correction data providing process will be described. FIG. 5 is a flowchart of the correction data providing process according to the first embodiment. This process is performed mainly by the control unit 12 of the server 10 and the control unit 22 of the mobile terminal 20 executing a prepared program.

  First, in the mobile terminal 20, the user operates the touch panel 24 to input the vehicle type information of the vehicle 7, and the mobile terminal 20 acquires this (step S11). Next, the portable terminal 20 performs the sound field measurement in the vehicle interior as described above, and generates measurement data (step S12). And the portable terminal 20 transmits vehicle type information and measurement data to the server 10 (step S13).

  Based on the vehicle type information, the server 10 extracts the measurement data of the same vehicle type already stored in the correction data DB 14, that is, the measurement data transmitted from the mobile terminal 20 of the other vehicle 7 until then. Then, using the measurement data received in step S13 and the measurement data extracted from the correction data DB 14, synchronous addition is performed as described above to generate correction data (step S14), and the correction data is transmitted to the portable terminal 20. (Step S15).

  When receiving the correction data, the portable terminal 20 transfers the correction data to the vehicle-mounted device 30 in the vehicle 7 (step S16). Thereby, the correction data transmitted from the server 10 is set in the vehicle-mounted device 30. Therefore, the music reproduced by the vehicle-mounted device 30 is subjected to sound field correction suitable for the vehicle type based on the correction data.

  As described above, according to the first embodiment, the server 10 collects measurement data measured in the plurality of vehicles 7 from each portable terminal 20 and performs synchronous addition using measurement data of a large number of samples. To generate correction data. Therefore, the measurement time in each vehicle can be shortened, so that the user can be in the vehicle during the sound field measurement. Thus, sound field correction data suitable for the type of vehicle can be generated while reducing the measurement burden on each vehicle.

(Modification)
In the above example, the vehicle type information is transmitted from the mobile terminal 20 to the server 10, and the server 10 generates correction data for each vehicle type and provides it to the mobile terminal 20. In addition to this, information on the vehicle-mounted device used in the vehicle is also transmitted from the portable terminal 20 to the server 10, and the server 10 generates correction data for each vehicle type and each type of the vehicle-mounted device 30 to generate the portable terminal 20. May be provided.

[Second Embodiment]
The second embodiment relates to processing when there are a plurality of measurement items for sound field correction. Assume that there are three measurement items A to C as measurement items for sound field correction. For example, the measurement item A may be an impulse response, the measurement item B may be a frequency characteristic, and the measurement item C may be a reverberation characteristic. In this case, for each measurement item, the server 10 receives measurement data from a plurality of portable terminals 20 for each vehicle type and generates correction data by synchronous addition, but the number of measurement data samples is insufficient as described above. If so, it is difficult to ensure the accuracy of the generated correction data. Therefore, the server 10 stores the number of measurement data samples collected for each measurement item in the storage unit 13, and the measurement item for which the number of samples is insufficient (hereinafter referred to as "sample shortage item"). To the portable terminal 20 to request measurement data for the measurement item.

  FIG. 6 is an example of the number of samples for each measurement item stored in the storage unit 13 of the server 10. The number of measurement data samples already obtained for the measurement items A to C is stored for each vehicle type. Assuming that the number of samples of 50 or more is necessary in order to ensure the accuracy of the correction data to be created, the measurement item having the number of samples in FIG. This is a sample shortage item. Therefore, the server 10 notifies the sample shortage item and requests transmission of measurement data for the vehicle of the vehicle type having the sample shortage item. As a result, the server 10 can facilitate the collection of measurement data for the sample shortage items and ensure the accuracy of the correction data provided to the mobile terminal 20.

  FIG. 7 is a flowchart of the correction data providing process in the second embodiment. First, in the portable terminal 20, when a user operates the touch panel 24 and inputs the vehicle type information of the vehicle 7, the portable terminal 20 acquires this (step S21) and transmits it to the server 10 (step S22).

  When the server 10 receives the vehicle type information, the server 10 refers to the number of samples for each measurement item as illustrated in FIG. 6 and identifies a sample shortage item for the vehicle type (step S23). Then, the server 10 notifies the portable terminal 20 of the specified sample shortage item (step S24).

  The portable terminal 20 receives the notification of the sample shortage item, performs measurement on the measurement item, generates measurement data (step S25), and transmits it to the server 10 (step S26).

  The server 10 uses the transmitted measurement data to generate correction data for the sample shortage item and stores it in the correction data DB 14 (step S27). And the server 10 acquires the correction data regarding the vehicle type (in this example, correction data for the measurement items A to C) from the correction data DB 14 and transmits it to the mobile terminal 20 (step S28). As a result, for the sample shortage item, correction data newly created using the measurement data transmitted from the mobile terminal 20 in step S26 is transmitted to the mobile terminal 20.

  And the portable terminal 20 will transfer to the onboard equipment 30 in the vehicle 7, if correction data are received (step S29). Thereby, the correction data transmitted from the server 10 is set in the vehicle-mounted device 30. Therefore, the music reproduced by the vehicle-mounted device 30 is subjected to sound field correction suitable for the vehicle type based on the correction data.

  Note that the server 10 not only notifies the portable terminal 20 of the sample shortage item for which the measurement data is lacking as described above, but also transmits a test sound for measuring the sample shortage item to the portable terminal 20. Good. The test sound is a signal prepared for measuring an impulse response, a frequency characteristic, a reverberation characteristic, etc. according to a sample shortage item. For example, when the sample shortage item is the measurement item A, the server 10 transmits a signal for measuring the impulse response as the test sound. Similarly, when the sample shortage item is the measurement item B, the server 10 transmits a signal for measuring frequency characteristics as a test sound.

  As described above, according to the second embodiment, the server 10 notifies the portable terminal 20 of the measurement item for which the number of samples is insufficient, and promotes the collection of measurement data for the measurement item. For this reason, the server 10 can quickly collect measurement data of the number of samples necessary to ensure the accuracy of the correction data, and can quickly ensure the accuracy of the correction data provided to the mobile terminal 20. It becomes.

[Third embodiment]
In the third embodiment, correction data is generated in consideration of the appropriateness in the measurement of the mobile terminal 20 used for the sound field measurement in the vehicle 7. In the vehicle 7, various portable terminals 20 are used, and the performance of the built-in microphone 25 is also different. Therefore, the measurement data measured by the portable terminal 20 including the low-performance microphone 25 may be inappropriate for creating correction data on the server 10 side.

  Therefore, in the third embodiment, when the mobile terminal 20 uploads the measurement data to the server 10, the model information of the mobile terminal 20 is also transmitted. The server 10 creates correction data for each vehicle type and for each model of the mobile terminal 20, and evaluates the appropriateness of each mobile terminal 20 for each vehicle type.

  FIG. 8 shows an example of the evaluation result of the mobile terminal 20. The appropriateness of the vehicle type is determined for the combination of the portable terminal 20 and the vehicle type. The appropriateness for each vehicle type can be considered to indicate the compatibility between the mobile terminal 20 and the vehicle type. Then, the overall suitability for the mobile terminal 20 is determined by summing up the suitability of each vehicle type. Note that these evaluations are basically performed by generating a distribution of correction data values generated using each mobile terminal 20 and calculating a deviation value. That is, it is determined that the appropriateness is high when the value of the obtained correction data is close to the standard value, and the appropriateness is low when it is far from the standard value. For example, when performing time alignment correction as sound field correction, the correction data is given as a delay amount from the farthest speaker. Therefore, the delay amount is calculated as the correction data for each combination of the mobile terminal and the vehicle type, and the appropriateness is determined based on the distribution. In the example of FIG. 8, the appropriateness is determined in three stages of ranks A to C based on whether or not the value of the correction data is close to the standard value. The appropriateness A rank is the closest to the standard value, and the appropriateness C rank is the farthest from the standard value.

  The server 10 calculates the appropriateness of the vehicle type and the overall appropriateness, and creates correction data to be finally stored in the correction data DB 14 in consideration of this. In one example, the measurement data acquired from the mobile terminal 20 whose overall suitability is C rank is not used for generation of correction data. In another example, the measurement data is used by weighting according to the total suitability. For example, the weight value “2” is assigned to the measurement data acquired from the mobile terminal 20 with the overall suitability level A rank, and the weight value “1” is assigned to the measurement data acquired from the mobile terminal 20 with the overall suitability degree B rank. And the correction data is generated by assigning a weight value “0.5” to the measurement data acquired from the mobile terminal 20 having the overall suitability C rank. As described above, the appropriateness is evaluated for each mobile terminal 20 that uploads the measurement data, and the correction data is generated in consideration of the appropriateness, so that highly accurate correction is not affected by the performance difference of the mobile terminal 20. Data can be generated.

  In the above example, the appropriateness is set in three ranks A to C, and the weight value is set for each rank. However, the application of the present invention is not limited to this. Instead, for example, the appropriateness may be set as a numerical value of 0 to 1 (“0” is the lowest appropriateness, “1” is the highest appropriateness), and the value may be used as the weight value.

  FIG. 9 is a flowchart of the correction data providing process according to the third embodiment. First, in the mobile terminal 20, the user operates the touch panel 24 to input the vehicle type information of the vehicle 7, and the mobile terminal 20 acquires this (step S31). Next, the mobile terminal 20 acquires model information of the mobile terminal 20 (step S32). Specifically, when model information such as the model number of the mobile terminal 20 is stored in the storage unit 23 of the mobile terminal 20, the mobile terminal 20 simply reads the model information. On the other hand, when the model information is not stored in the storage unit 23 or the like, the mobile terminal 20 requests the user to input the model information, and acquires the model information input by the user operating the touch panel 24.

  Next, the portable terminal 20 performs the sound field measurement in the vehicle interior as described above, and generates measurement data (step S33). And the portable terminal 20 transmits vehicle type information, model information, and measurement data to the server 10 (step S34).

  Based on the vehicle type information, the server 10 extracts the measurement data of the same vehicle type already stored in the correction data DB 14, that is, the measurement data transmitted from the mobile terminal 20 of the other vehicle 7 until then. Then, using the measurement data received in step S34 and the measurement data extracted from the correction data DB 14, synchronous addition is performed as described above to generate correction data (step S35). At this time, as described above, the server 10 refers to the appropriateness of the mobile terminal 20 based on the received model information of the mobile terminal 20, performs necessary weighting, and generates correction data. Then, the server 10 transmits the generated correction data to the mobile terminal 20 (step S36).

  When receiving the correction data, the portable terminal 20 transfers the correction data to the vehicle-mounted device 30 in the vehicle 7 (step S37). Thereby, the correction data transmitted from the server 10 is set in the vehicle-mounted device 30. Therefore, the music reproduced by the vehicle-mounted device 30 is subjected to sound field correction suitable for the vehicle type based on the correction data.

  As described above, according to the third embodiment, the server 10 can generate highly accurate correction data by eliminating the influence of the performance difference of the mobile terminal 20 that generates and transmits measurement data. The terminal 20 can also correct the sound field in the passenger compartment based on such highly accurate correction data.

[Fourth embodiment]
In the fourth embodiment, correction data is created according to the position in the passenger compartment when the sound field is measured by the vehicle 7. When the sound field measurement is performed with the vehicle 7, the measurement position (that is, the listening position) is the position where the mobile terminal 20 is disposed. That is, if the mobile terminal 20 is placed in the driver's seat and the sound field is measured, the obtained data becomes measurement data with the driver's seat as the listening position, and the mobile terminal 20 is installed in the passenger seat and the sound field is measured. For example, the obtained measurement data is measurement data with the passenger seat as the listening position. Therefore, in the fourth example, when the portable terminal 20 uploads the measurement data to the server 10, it transmits the position information indicating the measurement position together. The server 10 classifies the measurement data collected from the plurality of mobile terminals 20 for each measurement position, and generates correction data for each measurement position.

  FIG. 10 shows an example of correction data stored in the correction data DB 14 when correction data is generated for each measurement position in the passenger compartment. In this example, three driver positions, a passenger seat, and a rear seat (rear seat) are used as measurement positions. Actually, the measurement is performed with the user sitting on these seats and holding the portable terminal 20 near the head.

  In this way, the measurement data is uploaded from the portable terminal 20 to the server 10 for each measurement position in the vehicle interior, and the server 10 generates correction data for each measurement position, thereby taking into account the actual listening position of the user in the vehicle interior. The sound field can be corrected with high accuracy.

  In the example of FIG. 10, the measurement positions are classified into the driver seat, the passenger seat, and the rear seat, but the application of the present invention is not limited to this. For example, the rear seat may be further divided into a rear left seat and a rear right seat. As another classification method, the driver seat, the passenger seat, the front seat, the rear seat, and all seats may be classified. In this case, “front seat” refers to the case where the measurement position (= listening position) is between the driver seat and the passenger seat, and “rear seat” refers to the case where the measurement position is between the rear left seat and the rear right seat. “All seats” refers to the case where the measurement position is approximately in the center of the passenger compartment (between the front and rear seats and between the left and right seats).

  FIG. 11 is a flowchart of the correction data providing process according to the fourth embodiment. First, in the mobile terminal 20, the user operates the touch panel 24 to input the vehicle type information of the vehicle 7, and the mobile terminal 20 acquires this (step S41). Next, the portable terminal 20 acquires measurement position information (step S42). Specifically, the portable terminal 20 requests the user to input a measurement position, and acquires the measurement position input by the user operating the touch panel 24 as measurement position information.

  Next, the portable terminal 20 performs the sound field measurement in the vehicle interior as described above, and generates measurement data (step S43). And the portable terminal 20 transmits vehicle type information, measurement position information, and measurement data to the server 10 (step S44).

  Based on the vehicle type information, the server 10 extracts the measurement data of the same vehicle type already stored in the correction data DB 14, that is, the measurement data transmitted from the mobile terminal 20 of the other vehicle 7 until then. Then, using the measurement data received in step S44 and the measurement data extracted from the correction data DB 14, synchronous addition is performed as described above to generate correction data (step S45). At this time, as described above, the server 10 generates correction data for the measurement position acquired in step S44. Then, the server 10 transmits the generated correction data to the mobile terminal 20 (step S46).

  When receiving the correction data, the portable terminal 20 transfers the correction data to the vehicle-mounted device 30 in the vehicle 7 (step S47). Thereby, the correction data transmitted from the server 10 is set in the vehicle-mounted device 30. Therefore, the music reproduced by the vehicle-mounted device 30 is subjected to sound field correction suitable for the vehicle type based on the correction data.

  As described above, according to the fourth embodiment, the server 10 can generate and provide correction data for each measurement position, so that the optimum sound field correction is performed according to the listening position in the passenger compartment. Can do.

[Fifth embodiment]
In the fifth embodiment, when the number of measurement data samples when the correction data is created in the server 10 is insufficient, the server 10 first creates correction data with the insufficient number and provides the correction data to the portable terminal 20. Thereafter, when the necessary number of samples is obtained, correction data is generated again and transmitted to the portable terminal 20.

  As described above, when the number of measurement data samples is sufficient, the accuracy of the correction data generated by the server 10 can be ensured. However, when the number of measurement data samples is small, the accuracy of the correction data generated is ensured. Difficult to do. However, if the server 10 does not provide the correction data until a sufficient number of samples of measurement data are obtained, the user provides the correction data even though the user has performed the sound field measurement and uploaded the measurement data to the server 10. Will not be accepted, and willingness to upload measurement data will be reduced.

  Therefore, in the fifth embodiment, the server 10 first generates correction data and provides it to the mobile terminal 20 even when the number of samples is insufficient. However, the correction data provided at that time is not necessarily accurate enough, so when a sufficient number of samples are obtained and high-precision correction data can be generated, the high-precision correction data is renewed. Provide to the mobile terminal 20. In this way, collection of measurement data from the user is facilitated, and correction data with high accuracy can be provided from the server 10 at an early stage.

  FIG. 12 is an example of data stored in the correction data DB 14 of the server 10 in the fifth embodiment. The correction data generated at that time is stored in association with the vehicle type, and the number of samples of measurement data used when the correction data is generated is stored. Now, it is assumed that the number of measurement data samples necessary to generate correction data with sufficient accuracy is “50”. That is, when the number of measurement data samples is 50 or less, the number of samples is insufficient (in FIG. 12, the number of samples in the insufficient state is underlined). Therefore, correction data generated in a state where the number of samples is insufficient (hereinafter referred to as “sample shortage correction data”) is stored in association with the terminal ID of the mobile terminal 20 that provided the correction data. . In the example of FIG. 12, for the vehicle type “Company A AAA 2012-Present”, the number of measurement data samples is “15”, and the correction data is insufficient sample number correction data. When the correction data is provided, the terminal ID of the provision destination is stored. Then, when the number of measurement data samples exceeds “50” and correction data with a certain level of accuracy can be generated, the correction data is provided again to the portable terminal 20 stored as the provision destination terminal ID.

  FIG. 13 is a flowchart of the correction data providing process according to the fifth embodiment. First, in the mobile terminal 20, the user operates the touch panel 24 to input the vehicle type information of the vehicle 7, and the mobile terminal 20 acquires this (step S51).

  Next, the portable terminal 20 performs the sound field measurement in the vehicle interior as described above, and generates measurement data (step S52). And the portable terminal 20 transmits vehicle type information and measurement data to the server 10 (step S53).

  Based on the vehicle type information, the server 10 extracts the measurement data of the same vehicle type already stored in the correction data DB 14, that is, the measurement data transmitted from the mobile terminal 20 of the other vehicle 7 until then. Then, using the measurement data received in step S53 and the measurement data extracted from the correction data DB 14, synchronous addition is performed as described above to generate correction data (step S54). At this time, the server 10 refers to the number of samples of the measurement data used to create the correction data, and determines whether the number of samples is sufficient, that is, whether the generated correction data corresponds to the insufficient sample number correction data. (Step S55).

  When the sample number deficiency correction data is satisfied (step S55: Yes), the server 10 stores the terminal ID of the portable terminal 20 at that time in the correction data DB 14 as illustrated in FIG. 12 (step S56). On the other hand, when the sample number deficiency correction data is not applicable (step S55: No), the process of step S56 is not performed. Then, the server 10 transmits the generated correction data to the mobile terminal 20 (step S57).

  When receiving the correction data, the portable terminal 20 transfers the correction data to the vehicle-mounted device 30 in the vehicle 7 (step S58). Thereby, the correction data transmitted from the server 10 is set in the vehicle-mounted device 30. Therefore, when the sample number shortage correction data is transmitted from the server 10, the correction data is set in the vehicle-mounted device 30, so that the accuracy of the sound field correction in the passenger compartment is not necessarily sufficient.

  However, when the number of samples of the measurement data of the same vehicle type increases in the server 10 after that and reaches a sufficient number of samples, the server 10 generates highly accurate correction data and refers to the correction data DB 14 in the past. High-precision correction data is transmitted to the portable terminal 20 that has transmitted the shortage correction data. Therefore, the portable terminal 20 receives the high-accuracy correction data, transfers it to the vehicle-mounted device 30, and sets it, thereby enabling high-accuracy sound field correction.

  Note that when the server 10 transmits the insufficient sample number correction data to the portable terminal 20 in step S57, the server 10 may notify the user of the portable terminal 20 by transmitting a message to that effect. For example, “The correction data to be sent this time was generated with an insufficient number of samples. When the number of samples becomes sufficient later, we will send more accurate correction data.” May be sent. This allows the user to wait for highly accurate correction data even if the sound field correction by the correction data transmitted first is somewhat unsatisfactory.

  The present invention can be used for a system for reproducing music in a vehicle interior.

5 Network 10 Server 12 Control unit 14 Correction data DB
20 Terminal device 22 Control unit 25 Microphone 30 On-vehicle device 35 Speaker

Claims (7)

A portable terminal capable of communicating with a server that generates vehicle type sound field correction data using a plurality of uploaded vehicle type sound field measurement data,
Measuring means for measuring the sound field of the first vehicle and generating first sound field measurement data;
First acquisition means for acquiring vehicle type information of the vehicle to be measured;
Second acquisition means for acquiring model information of the mobile terminal used for the measurement;
Transmitting means for transmitting the sound field measurement data, the vehicle type information, and the model information to the server;
Vehicle type sound field correction data generated based on sound field measurement data generated by a model determined to be appropriate in the measurement based on the model information and generated by the vehicle type indicated by the vehicle type information; Receiving means for receiving from,
A portable terminal comprising: A storage unit for storing the model information;
The mobile terminal according to claim 1, wherein the second acquisition unit acquires the model information by reading the model information from the storage unit. The receiving means measures the first sound field measurement data and a second sound generated by measuring a sound field of a second vehicle which is a vehicle different from the first vehicle and which is the vehicle type. Vehicle type sound field correction data corresponding to the vehicle type information generated based on the field measurement data, and received from the server,
The mobile terminal according to claim 1, further comprising a transfer unit configured to transfer the received vehicle-specific sound field correction data to an on-vehicle device attached to the vehicle. The measuring means includes
An output means for outputting a test signal to the vehicle-mounted device attached to the vehicle;
Sound collection means for collecting the test sound output to the vehicle cabin by reproducing the test signal by the vehicle-mounted device and generating the sound field measurement data;
The mobile terminal according to any one of claims 1 to 3, further comprising: A sound field correction method executed by a mobile terminal capable of communicating with a server that generates vehicle-specific sound field correction data using a plurality of uploaded vehicle-specific sound field measurement data,
A measurement step of measuring the sound field of the first vehicle and generating first sound field measurement data;
A first acquisition step of acquiring vehicle type information of the vehicle to be measured;
A second acquisition step of acquiring model information of the mobile terminal used for the measurement;
A transmission step of transmitting the sound field measurement data, the vehicle type information, and the model information to the server;
Vehicle type sound field correction data generated based on sound field measurement data generated by a model determined to be appropriate in the measurement based on the model information and generated by the vehicle type indicated by the vehicle type information; A receiving process to receive from,
A sound field correction method comprising: A program executed by a portable terminal having a computer and capable of communicating with a server that generates vehicle-specific sound field correction data using a plurality of vehicle-specific sound field measurement data uploaded,
Measuring means for measuring the sound field of the first vehicle and generating first sound field measurement data;
First acquisition means for acquiring vehicle type information of the vehicle to be measured;
Second acquisition means for acquiring model information of the mobile terminal used for the measurement;
Transmitting means for transmitting the sound field measurement data, the vehicle type information, and the model information to the server;
Vehicle type sound field correction data generated based on sound field measurement data generated by a model determined to be appropriate in the measurement based on the model information and generated by the vehicle type indicated by the vehicle type information; Receiving means for receiving from,
A program for causing the portable terminal to function as:   A storage medium storing the program according to claim 6.

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